81814429570 has 16 divisors (see below), whose sum is σ = 147588226488. Its totient is φ = 32654160000.

The previous prime is 81814429561. The next prime is 81814429607. The reversal of 81814429570 is 7592441818.

It can be written as a sum of positive squares in 4 ways, for example, as 80044292241 + 1770137329 = 282921^2 + 42073^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8946681 + ... + 8955820.

Almost surely, 2^81814429570 is an apocalyptic number.

81814429570 is a deficient number, since it is larger than the sum of its proper divisors (65773796918).

81814429570 is a wasteful number, since it uses less digits than its factorization.

81814429570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17902965.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 81814429570 in words is "eighty-one billion, eight hundred fourteen million, four hundred twenty-nine thousand, five hundred seventy".